Golf ball



April 21, 19,25. 1,535,053

A. SPEEDY GOLF'BALL Filed Jan.. 24, 1925 llO .Patented Apr, l, lldo ALAN SPEEDY, 0F LONDON, ENGLAND, ASSIGNRI T0 il. G. SPALDING @n BROS., OF NEW YORK, N. Y., A COBIPOMTIN 0F NEW JERSEY.

GULF BALL.

Application filed January 2, 3.9%.

To all whom t may concern:

Be it known that l, ALAN SPEEDY, subject of the King of Great Britain, and resident of London, England, have invented certain new and useful improvements in Golf Balls, of which the following is a specification.

rlhis invention relates to golf balls of the type comprising an inner core of wound rubber and an outer cover or case, and the invention, in one aspect, has reference to the manufacture of and composition for golf ball vulcanized covers of the character described in British Letters lPatent Nos. 17 8,7 96 and 174,010.

Patent specification fNo. 17 8,796 relates to a golf ball cover composed principally of vulcanized balata or like gum, or of a vulcanized mixture of balata and rubber. 'lhe mixture comprises balata or the like, rubber, sulphur, zinc oxide, i and zinc amyl xanthate (or xanthogenate). Hemispherical cups of this substance are pressed on to a golf ball center, the mold being located between the platens of a hot-plate press and kept at a temperature of about 210-220 F. 'llhe relatively stid cover portions hold the mold open until the heat softens them, after which pressure is applied. rlhe balls are kept in the mold long enough to start vulcanization without in3ury to the center, and are then removed and allowed to air-cure, the zinc amyl xanthate acting as an accelerator.

@ne of the objects of the present invention is to provide a golf ball cover of greater toughness or resistance to cutting than at present in use. l find that not only is my invention applicable to the vulcanized cover referred to above, but that l secure a similar toughening eHect when applying it to the well known unvulcanized golf ball covers.

While in the patents referred to above., the term balata (extracted) is employed, it is to be understood that the usual material for Selia No. 4,544.

fied by the addition thereto of a reinforcing colloidal material, and when the cover is not to be vulcanized, a composition omitting the vulcanizing agents is employed.

A suitable reinforcing colloid is animal glue, such as bone glue, which is preferably incorporated in the composition or mixture in the proportion of 17 to 25 percent.

ln carrying the invention into effect by way of example, the composition for the golf bali covering, when said covering is to be vulcanized, may comprise- Per cent. Grutta i5 Rawy rubber 22 Glue (preferably bone glue) 21 Zinc oxide 10 Sulphur 11/2 Zinc ethyl xanthate 1 (or any appropriate accelerator) The proportions, as well as the nature, of the ingredients may be considerably varied according to the quality of cover desired, without departing from the spirit of my invention.

ln milling the ingredients, the gutta, sulphur and zinc oxide are preferably mixed in one batch, and the rubber, glue and accelerator, in another, in order to minimize aircuring on the mill.

rlfhe glue may be added in with the other constituents of the batch, or it may be mixed with rubber in equal quantities to form a master batch, the correct amount being taken to give the right proportion for the composition.

rlhe two batches are then milled together, the covering applied to the ball, molded, vul4 canized and' cured, after the -method de-U scribed in the specification No. 17 8,796, referred to above.

When the cover is not to be vulcanized, but is to be molded on the center according to well known practice, under gentle heat,

the following will be found a desirable formula- Parte. Gutta 12 Raw rubber 6 Glue (preferably bone glue) 5 Zinc oxide 2 A golf ball constructed in accordance with my inventlon, 1s shown 1n section 1n the accompanying drawing, in which the mit numeral 1, indicates the golf ball center comprising a core la and a Winding of rubber thread 1b thereon, and Q the enclosing cover or shell.

Having thus described my invention, what I claim is 1. A golf ball comprising a center having vulcanized thereon a cover or shell comprising gutta and a colloidal substance.

2. A golf ball comprising a center having vulcanized thereon a cover or shell comprising gutta, rubber, and av colloidal substance. Y

3. Agolf ball comprising a center having vulcanized thereon a cover or shell including in its composition gutta and glue.

4. A golf ball comprising a center having vulcanized thereon a cover or shell including in its composition gutta, rubber, and glue.

5. A golf ball comprising a center, and an enclosing shell or cover vulcanized thereon composed of gutta, rubber, a. colloidal substance, zinc oxide, sulphur, and au accelerator in substantially the proportions specified.

6. A golf bal] comprising a center having thereon a cover or shell comprising gatta' f' and zinc oxide, in substantially the propor- 1 tions specified.

' In testimony whereof I, aliix my Signature.

ALAN SPEEDY. 

